Kṛṣṇa is taking the shape of a hog. Keśava dhṛta-śūkara-rūpa (Śrī Daśāvatāra-stotra 3). Hog is considered to be the lowest animal, because it eats stool. Just like in human society, those who are dog-eaters, they are considered the lowest of the human society, similarly, amongst the animals, the hog is considered to be the lowest of the animals, because it eats stool. But Kṛṣṇa took the appearance of a hog. That does not mean that Kṛṣṇa has become a hog. He is fully independent. And what sort of hog? That hog was covering practically half of the universe. It . . . He was so big.
And in the Śrīmad-Bhāgavatam, there is very nice explanation of the incarnation of hog. The . . . and They were being praised. The incarnation of hog was being praised from higher planets. The higher planets, three higher planets, they are resided by most pious men. They are called Janaloka, Tapoloka and Satyaloka. These three higher planets, they are considered to be the most pious place within this material world.
So they were praying, and when the incarnation of hog was sprinkling water by, I mean to say, shaking His body, and the sprinkle of the water was dropping in those three lokas, planets, and they were thinking themselves that, "We are becoming purified." Although they are considered to be the most pious and purified residents of this material world, still they prayed that "We are becoming purified."